Model behaviour! Harry Styles' ex Nadine Leopold nails off-duty chic with pal Gabby Westbrook at Victoria's Secret casting session in New York

By Kristy Johnson For Daily Mail Australia

Published: 19:59 EST, 21 October 2016 | Updated: 15:03 EST, 22 October 2016

She's the Austrian beauty who famously dated Harry Styles.

And on Friday, Nadine Leopold joined her model friend Gabby Westbrook for a Victoria's Secret casting in New York.

The leggy ladies were spotted perfecting the off-duty look in all-black ensembles as they posed for photographs.

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Model behaviour! Gabby Westbrook (L) and Nadine Leopold (R) perfected the off-duty look as they were spotted attending the Victoria's Secret castings in New York on Friday

Gabby and Nadine were spotted in head-to-toe black before it was their turn to audition for the US lingerie brand.

Brunette Gabby sported a simple black top with a plunging neckline, teamed with skinny jeans that highlighted her slender legs.

The Seafolly model accessorised with a pair of leather ankle boots and a Givenchy handbag.

Simply stunning: Gabby sported a simple black top with a plunging neckline, teamed with skinny jeans that highlighted her slender legs

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Everyone tries to emulate that model-off-duty look, so take inspiration from a real pro like Gabby Westbrook. The rules are to look effortless, keep things simple and add a touch of luxury here and there. Here she's in classic all black and accessories with classic 'Antigona' handbag. Model-off-duty perfection.

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Taking it in their stride! Despite the rainy conditions and stress of the castings, the close pals appeared to be in high spirits

Chic: Nadine carried her belongings in a quilted Chanel backpack, while Gabby opted for a sturdy Givenchy handbag

Famous faces: Blonde beauty Nadine once famously dated One Direction's Harry Styles, with the couple calling it quits in March last year

Enhancing her striking facial features, Gabby opted for a minimal make-up palette of a flawless base, defined brows and a soft pink lip. 

Meanwhile Harry Styles' ex Nadine Leopold, 22, drew attention to her lean legs in a black shift dress.

Layering with a leather jacket and accessorising with black ankle boots, the blonde carried her belongings in a quilted Chanel backpack.

Busty: Numerous snaps on Gabby's Instagram page sees the stunning brunette drawing attention to her model looks

Making waves: A friend of Shanina Shaik, Gabby has earned herself a steady career as a swimsuit model

Not shy! The slender starlet is certainly not afraid to flaunt her model figure to social media

Allowing her semi-straight tresses to fall effortlessly around her face and shoulders, Nadine sported a minimal make-up look of a flawless complexion and defined brows.

Despite the rainy conditions and stress of castings, the close pals were seen smiling as they made their way into the studio.

A quick glance at the girls' Instagram accounts show the 'It' girls hanging out with famous friends and showing off their model bodies.

If you've got it! Nadine often takes to her Instagram account, sporting a number of skimpy bikinis that leave very little to the imagination

That's a bit cheeky! The former flame of Harry Styles is represented by IMG Models

Sticking together: Despite competing in the same industry, the close pals have nothing but support for one another

It was reported by Hollywood Life that Nadine dumped the One Direction hunk in March last year.

A source told the website at the time that Nadine 'wanted a more serious commitment from Harry' and 'doesn’t have time for any games in her life.'

Harry has since moved on with a bevvy of other beauties including fellow model and Victoria's Secret Angel Kendall Jenner. 

High-profile pals: Nadine counts Victoria's Secret Angel Shanina Shaik (pictured) as a friend

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